Preprints
https://doi.org/10.5194/egusphere-2023-2251
https://doi.org/10.5194/egusphere-2023-2251
24 Oct 2023
 | 24 Oct 2023

The characteristics of tides and their effects on the general circulation of the Mediterranean Sea

Bethany McDonagh, Emanuela Clementi, Anna Chiara Goglio, and Nadia Pinardi

Abstract.

The effects of tides on the Mediterranean Sea’s general circulation, with a particular focus on the horizontal and vertical currents, are investigated using twin simulations with and without tides. Amplitudes of tides in the region are typically low, but an analysis of the kinetic energy demonstrates that tides have effects across many spatial and temporal scales in the basin, including nonlinear effects at short periods (less than one day) with high kinetic energy peaks at near-inertial, basin modes and tidal frequencies. Internal tidal waves are also revealed below 100 m. Tides are found to amplify several basin modes of the Mediterranean Sea, broaden several tidal frequency energy spectra bands, as well as interact energetically with near-inertial waves. Tides are found to increase the mixed layer depth in the Mediterranean Sea, particularly in the deep and intermediate water formation areas of the Western and Eastern basins. It is confirmed that the net mass transport through the Gibraltar Strait is unchanged by tides, but both inflow and outflow increase.

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Bethany McDonagh, Emanuela Clementi, Anna Chiara Goglio, and Nadia Pinardi

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-2251', Anonymous Referee #1, 26 Nov 2023
    • AC1: 'Reply on RC1', Bethany McDonagh, 18 Mar 2024
  • RC2: 'Comment on egusphere-2023-2251', Anonymous Referee #2, 08 Dec 2023
    • AC2: 'Reply on RC2', Bethany McDonagh, 18 Mar 2024
  • EC1: 'Comment on egusphere-2023-2251', Joanne Williams, 24 Mar 2024
    • AC3: 'Reply on EC1', Bethany McDonagh, 26 Mar 2024
Bethany McDonagh, Emanuela Clementi, Anna Chiara Goglio, and Nadia Pinardi
Bethany McDonagh, Emanuela Clementi, Anna Chiara Goglio, and Nadia Pinardi

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Short summary
Tides in the Mediterranean Sea are typically of low amplitude, but twin experiments using numerical models with and without tides demonstrates that tides affect the circulation on temporal and spatial scales away from those of the tides directly. Tides enhance existing oscillations, and increase the upper layer salinity. Tides are also found to increase the mixed layer depth and enhance dense water formation in key regions. Internal tides are found to be widespread in the Mediterranean Sea.